I'm rather disappointed with a lot of what I've seen, but there are a few things I like.
I prefer the previous rogue and cleric, but I like how removing some of the their class abilities allowed them to be put into specialties for anyone. Like the thief hiding and seeing in the dark becoming the hide in shadows feat.
I greatly dislike the change to minor spells at first blush, but I'm withholding judgement till I get a better look. I do realize that tying them to tradition allows for tradition that don't grant at-will spells, which is an option that some have been clamoring for.
I would prefer sneak attack to be more circumstantial and powerful. This option just makes it the poor man's deadly strike. That's okay since they are for different classes (though I'm not a huge fan of this approach), but I would prefer perhaps deal double the expertise dices rolled result but make it harder to pull off.
The previous cleric was more flavorful. Just let channel divinity also include turning undead as a default along with the deity/domain based ability.
I'm reserving final judgement till I play. Also making it a point to not fill out the next survey till I've gotten a decent chunk of experience with this newest system.